Eduaed selor



UNITED STATES PATENT OFFICE.

EDUARD SENN, QF NEW YORK, N. Y.

PUNCH FOR GUMMING CIRCULAR SAWS.

SPECIFICATION forming part of Letters Patent No. 238,060, dated February22, 1881. Application filed August 12 1880. (No model.)

T 0 all whom it may concern:

Be it known that I, EDUARD SENN, of the city, county, and State of NewYork, have invented certain new and useful Improvements in Punches forGumming Circular Saws, of which the following is a specification.

In the accompanyin drawings, Figure 1 represents a sectional sideelevation; Fig. 2, a horizontal section on line 0000, Fig. 1; Fig. 3, afront view of my improved punch for gumming circular saws, and Fig. 4shows a portion of a circular saw being partly gum med by my improvedpunch.

Similar letters of reference indicate corresponding parts.

This invention relates to an improved hand press or punch for gummingcircular saws with great facility at a saving of time and labor; and theinvention consists of a verticallyguided and spring-acted punch, whichis ex tended by its lower or narrower part through the die set into thelower part of a recessed handle, while the upper or larger part of thepunch is guided in the upper part of the ban die and acted upon by acam-lever pivoted thereto.

In the drawings, A represents the main lever or handle of my improvedpunch for gain.- miug circular saws, which handle is provided with anenlarged and recessed end portion, 13, into the lower part of which thedie 0 is rigidly secured by a wedge-key or otherwise.

The punch l) is made wider at its upper part than at its lower part, thelatter narrower part being passed through the die and through a hole ofthe recessed end portion B in line with the opening of the die, andactedupon at its lower end by a strong band-spring, D.

The upper larger part of the punch Dis guided in a slot of the upperpart of the enlarged portion B, and acted upon by a cam-lever, E, whichis pivoted to the recessed upper part of the end portion, B, so that bythrowing the cam-lever down the punch D is lowered into the die, andthereby a piece of a size corresponding to the upper projecting portionof the punch is cut out from the saw-tooth,as shown in Fig. 4. When thecam-leveris raised the punch is lifted by its spring so as to clear thedie, ready for the next gumming.

The front edge of the punch and die is of semicircular shape, so as toproduce a corresponding semicircular bottom for the throat of the tooth.

By the use of this cheap and simple handpunch the'gumming of circularsaws can be accomplished without the aid of more expensive presses ortools, and in a cheaper and better manner than by filing.

Having thus described my invention, 1 claim as new and desire to secureby Letters Patent- The combination of handle A, provided with enlargedhead B, cam-lever E, punch D, die 0, and spring D, substantially asdescribed.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two witnesses, this 10th day ofAugust, 1880.

EDUARD SENN.

Witnesses PAUL GoEPEL, CARL KARP.

